Solenocera geijskesi Holthuis 1959

Solenocera geijskesi Holthuis, 1959:56, figs. 4, 5

MATERIAL.—MEXICO (Western Caribbean). Quintana Roo: 1 ♀, USNM, SE of I Mujeres, 458–37–284 m, 23 May 1967, Pillsbury sta 582.

SURINAM. 1 ♀, USNM, off Mouth Coppename Rivier, 35 m, 3 September 1958, Oregon sta 2277. 1 ♀, paratype, USNM 103099, NW of Paramaribo, 42 m, 20 June 1957, Coquette sta 260. 1 ♂, paratype, USNM 103100, off Surinam. 1 ♀, USNM, N of Metappica Kreek, 18 m, 13 May 1957, Coquette sta 44. 2 ♀, USNM, N of Wiawia Kreek, 31 m, 15 September 1958, Oregon sta 2327.

FRENCH GUIANA. 1 ♂ 10 ♀, USNM, N of Îles du Salut, 60 m, 8 July 1968, Pillsbury sta 652. 1 ♀, USNM, N of Cayenne, 60 m, 12 September 1958, Oregon sta 2311. 1 ♀, USNM, NE of Cayenne, 64 m, 23 February 1963, Oregon sta 4202.

BRAZIL. Maranhão: 1 ♂, USNM, N of Ilhas de São João, 44 m, 26 April 1968, Exped. N–NE II sta 1887. 1 ♂, UFRJ, off Maranhão [?2085 m], 4 April 1968, Exped. N–NE II sta 1883.

Ceará: 2 ♀, USNM, off Camocim, 40 m, 12 March 1963 Oregon sta 4251.

DIAGNOSIS.—Rostral + epigastric teeth 7–8. Anterior part of carapace with short setae; postrostral carina ending at level of cervical sulcus; pterygostomian spine with narrow base, its dorsal margin joining carapace at about right angle. Prosartema long, conspicuously overreaching distal end of first antennular segment. Scaphocerite short, not exceeding antennular peduncle by more than 10 percent of its own length. Petasma with ventrolateral lobule distally produced into narrow, pointed lamella, armed with lateral spines, and considerably surpassing dorsomedian lobule. Thelycum with sternite XIII lacking anteromedian ridge, and with posterior portion, just in advance of coxae of fourth pereopods, sloping dorsally, giving rise to median-platelike structure; paired protuberances on sternite XIV rounded to subelliptical in outline, and bearing apical tubercle.

DESCRIPTION.—Carapace with short setae on anterior part, and few, relatively long setae on dorsal border of pterygostomian pit (Figure 15); patch of thickly set setae covering portion of rostrum dorsal to adrostral carina and continuing posteriorly to base of first tooth. Rostrum reaching almost to, or slightly beyond, distal end of first antennular segment, horizontal, moderately deep, its dorsal margin straight and ventral margin pronouncedly convex, sometimes with subapical concavity; tip short. Rostral + epigastric teeth 7–8; second rostral tooth at level of orbital margin, epigastric situated at about posterior 0.45 of distance from orbital margin to dorsal extremity of cervical sulcus, and separated from first rostral tooth by interval much larger than spaces between remaining teeth. Adrostral carina short, extending obliquely from orbital margin to about level of ultimate tooth; postrostral carina short, extending only to level of dorsal extremity of cervical sulcus. Orbital spine small; postorbital spine long, pronouncedly acuminate; antennal and hepatic spines relatively short; pterygostomian spine small, with narrow base, its dorsal margin joining carapace at about right angle. Cervical sulcus ending at postrostral carina, without crossing it; cervical carina sharp; posterior portion of hepatic sulcus almost horizontal, merging with depressed area below hepatic spine, from there turning anteroventrally and ending at pterygostomian pit; anterior sulcus indistinct.

Antennular peduncle about 0.6 length of carapace; prostartema relatively long, extending to proximal part of second segment; stylocerite moderately long, 0.6–0.7 of distance between its proximal end and base of distolateral spine, and produced into acute spine; antennular flagella subequal, moderately long, ratio of length of dorsal flagellum to length of carapace ranging from 2 in shrimp with 13.5 mm c.l. to about 1.5 in shrimp with 18 mm c.l.; terminal filament apparently short; distolateral spine slender and relatively long, conspicuously surpassing distal end of first segment.

Scaphocerite almost reaching, or barely surpassing, distal end of antennular peduncle; lateral rib ending distally in slender spine, overreached by lamella; antennal flagella broken in all specimens examined.

Third maxilliped exceeding antennular peduncle by length of dactyl or by length of dactyl and 0.2 that of propodus; first pereopod extending to about distal end of carpocerite or exceeding it by as much as length of propodus and 0.2 that of carpus; second pereopod reaching to distal end of carpocerite or surpassing it by length of propodus and 0.1 that of carpus; third pereopod overreaching antennular peduncle by at least length of dactyl and at most by length of propodus and about 0.1 that of carpus; fourth pereopod exceeding antennular peduncle by at least 0.5 length of dactyl, and by as much as length of dactyl and 0.2 to 0.3 that of propodus; fifth pereopod surpassing antennular peduncle by length of dactyl and 0.1 to 0.3 that of propodus. Appendages longer in males than in females. Spines on basis and ischium of first pereopod long and strongly pointed; second pereopod with slender, acute spine on basis. Coxa of fourth pereopod of female produced posteromesially into elongate plate; coxa of fifth pereopod bearing prominent spine on anteromesial margin in females and on anterolateral margin in males.

Abdomen with middorsal carina from about anterior 0.35 length of third through sixth somite, carina low and rounded on third, relatively high and sharp from fourth posteriorly; posterodorsal margin of third, fourth, and fifth somites with median incision, sixth bearing small spine at posterior end of carina, and pair of posteroventral, minute spines. Telson with median sulcus deep anteriorly, increasingly shallower posteriorly; length of fixed lateral spines 0.6–0.8 basal width of terminal portion of telson; terminal portion rather short, length 2.8 to 3 times width at base; tip reaching about distal 0.2 of mesial ramus uropod; lateral ramus overreaching mesial by about 0.2 its own length.

Petasma (Figures 16A, B) with ventrolateral lobule and ventromedian lobule considerably surpassing dorsomedian lobule distally; dorsolateral and ventrolateral lobules separated by narrow, deep gap; distalmost part of ventromedian lobule considerably broadened, strongly produced mesially into elongate process, and distolaterally into scalelike one, both processes reflexed over outer surface, and margined with conspicuous spines; dorsolateral lobule bearing terminal process, bell shaped in outline, reflexed over outer surface, and armed with marginal spines, deep lateral emargination present at base of process; distal part of ventrolateral lobule bearing narrow, pointed lamella, armed with lateral spines; base of lamella delimited on outer surface by transverse ridge, latter turning proximally on ventral (lateral) margin of petasma, and ending there in subelliptical projection; ventral costa produced into prominent tooth, followed by small, submarginal scale; tooth forming base of elongate notch extending to projection of transverse ridge; inner surface of costa with submarginal row of long, plumose setae, proximal to notch.

Thelycum (Figure 17) with paired protuberances on anterior part of sternite XIV setose, rounded, or elongate and blunt, bearing minute apical tubercle; protuberances implanted rather close to each other and directly mesially; anterior part of sternite XIII lacking median ridge; posterior part, just in advance of fourth pereopods, sloping dorsally, giving rise to posteromedian platelike structure, delimited anteriorly by strong, setose, transverse ridge; posterior extremity deeply emarginate, forming paired, strong convexities, and produced anterolaterally into hornlike projections.

COLOR.—Unknown.

SIZE.—Females, 8–17 mm c.l.; males 7–10 cm c.l.

GEOGRAPHIC AND BATHYMETRIC RANGES.—Isla Mujeres, Quintana Roo, to Camocim, Ceará, Brazil (Figure 18), mostly at depth between 18 and 70 m (latter depth reported by Holthuis, 1959). The record from Isla Mujeres is the first from the Caribbean. For the first time too, S. geijskesi is reported here off Camocim, which represents an extension of about 2000 km southeastward of its limit of distribution, recorded previously from French Guiana (Holthuis, 1959). A single male was taken at a reported depth of 2085 m off Maranhão, during the Brazilian Expedition N–NE II, at sta 1883; the presence of this species in such deep water is doubtful.

SUBSTRATES.—Little is known on the habitats of this shrimp. It has been found on bottoms described as: mud; mud, shells, and coral (at Coquette stations; from Holthuis, 1959); mud and shells (Oregon 2327).