Processa profunda R. B. Manning & Chace 1971

Processa profunda

Processa canaliculata.—Rathbun, 1901: 104 [listed; part, specimens from Albatross station 2402 only].

HOLOTYPE.—, 7.2 mm; Gulf of Mexico, off west coast of Florida; 28°36′N, 85°33′30″W; 202 m; grey mud; Albatross station 2402; 14 March 1885; USNM 23382.

PARATYPES.—l, 2 (1 ovigerous); data as for holotype; USNM.—2 (1 ovigerous); Gulf of Mexico, Florida, southwest of Dry Tortugas; 24°20′N, 83°20′W; 346 m; Oregon station 1005; 13 April 1954; USNM.

DIAGNOSIS.—Antennal spine present. Stylocerite with large lateral spine. (Right pereiopod of first pair chelate, left with simple dactyl; first pereiopods lackingexopods.) Second pereiopods asymmetrical, right stronger. Right second pereiopod with 21–22 meral and 45–46 carpal articles, left second pereiopod with 5 meral and 18–21 carpal articles. (Fifth pereiopods incomplete.) Fifth abdominal somite unarmed posterolaterally. Abdominal sternites unarmed.

DESCRIPTION.—Rostrum (Figure 13a) almost straight, apex slightly deflexed, bifid, lower tooth longer, apex (Figure 13b) obscured by numerous long setae; lower margin of rostrum sinuous, convex proximally, slightly concave distally. Lower orbital angle broadly rounded. Antennal spine well developed. Lower anterior angle of carapace broadly rounded.

Abdomen (Figure 13c) smooth, bare, ventral margins of pleura lined with fine setae. Fifth abdominal somite rounded posterolaterally. Sixth abdominal somite only slightly longer than fifth, with posterolateral spine; lobe above articulation of uropod produced into small, sharp spine. Telson (Figure 14a) slightly more than 1½ times as long as sixth abdominal somite, length about 3½ times greatest width, with 2 pairs of dorsal and 2 pairs of distal spines; anterior pair of dorsal spines of telson set at end of proximal fourth, distal pair beyond midlength; distance between anterior margin and anterior pair of spines more than ½ the distance between pairs of spines; distal spines of telson (Figure 14b) as in P. bermudensis; apex of telson produced into small, sharp point.

Eyes (Figure 13a) moderately large, cornea width subequal to length of stalk and cornea combined, twice greatest width of antennal scale.

Antennular peduncle (Figure 13d) extending by 2 distal segments and about ½ of proximal segment beyond rostrum; basal segment of peduncle subequal in length to distal segments, ultimate segment 3/5 the length of penultimate; proximal segment of peduncle with ventral spine set slightly beyond midlength. Stylocerite (Figure 13e) with strong, acute lateral projection, anterior margin sloping proximally mesially, concave. Dorsolateral flagellum of antennule at least as long as carapace, thickened setigerous portion consisting of 20–27 articles, distal portion incomplete. Ventromesial flagellum of antennule broken, probably at least twice as long as carapace.

Antennal scale (Figure 13f) scarcely overreaching antennular peduncle, length of scale 6½ times greatest width; distal spine of scale slightly overreaching rounded anterior margin of blade. Proximal segment of antenna with slender outer spine. Antennal peduncle extending about to midlength of second segment of antennular peduncle. Antennal flagellum more than 4 times carapace length.

Third maxilliped (Figure 14c) overreaching antennal scale by distal and ½ of penultimate segments; ultimate segment ornamented with few spines, apex sharp, shorter than penultimate segment, and about 1/3 as long as basal segment. Mandible (Figures 13g, h) with row of about 18 spines on posterior margin of molar process. Remainder of mouthparts (Figures 13i–l) as in P. bermudensis.

Right pereiopod of first pair (Figure 14d) chelate, overreaching antennal scale by most of length of fingers of chela; fingers about ¾ the length of palm; carpus slightly longer than palm; merus about as long as carpus and chela combined. Left pereiopod of first pair (Figure 14e) with simple dactyl, overreaching antennal scale by dactyl and 1/3 of propodus; dactyl about 1/3 the length of propodus; carpus slightly shorter than propodus; merus shorter than remainder of distal segments combined. Arthrobranch present at base of first pereiopods. Second pereiopods asymmetrical, right (Figure 14f) longer, overreaching antennal scale by chela, carpus, and 3 distal articles of merus; merocarpal articulation of right pereiopod extending beyond eye; ischium with 3, merus with 21–22, and carpus with 45–56 articles; fingers subequal to or slightly longer than palm; carpus almost 11 times as long as chela; merus 6 times as long as chela; ischium shorter than merus. Left pereiopod of second pair (Figure 14g) overreaching antennal scale by chela and about 1/3 of carpus; ischium not divided, merus with 5 and carpus with 18–21 articles; fingers slightly longer than palm; carpus almost 7 times as long as chela; merus almost 4 times as long as chela; ischium slightly longer than merus. Third pereiopod (Figure 15a) overreaching antennal scale by dactyl, propodus, and about 1/3 of carpus; dactyl (Figure 15b) slender, simple, with subapical setae; propodus almost 4 times as long as dactyl, unarmed, with tufts of setae beyond midlength, and denser distal tufts of setae; carpus about 2 1/3 times as long as propodus, unarmed, not markedly setose; merus less than twice as long as propodus, with 5 movable spines on lateral surface; ischium shorter than merus, with 1 movable spine on lateral surface; combined lengths of propodus and carpus of third pereiopod subequal to that of ischium and merus. Fourth pereiopod (Figure 15c) overreaching antennal scale by dactyl, propodus, and about ½ of carpus; dactyl (Figure 15d) slender, simple, with dense subapical tuft of setae; propodus slightly more than 3 times as long as dactyl, unarmed, with tufts of setae proximal and distal to midlength, as well as denser distal tufts; carpus slightly more than twice as long as propodus, unarmed, not markedly setose; merus less than 1½ times as long as propodus, shorterthan carpus, with 5 movable spines on lateral surface; ischium shorter than merus, about as along as propodus, with 2 movable spines on lateral surface; combined lengths of propodus and carpus of fourth pereiopod greater than that of ischium and merus. Fifth pereiopod (Figure 15e) damaged or missing in all specimens, but extending beyond antennal scale by dactyl, propodus, and ½ of carpus; carpus longer than merus, unarmed; ischium shorter than merus, unarmed.

Endopod of first male pleopod (Figures 13m, n) about ½ as long as exopod, apex obliquely truncate, smooth, without setae or spines; inner margin more setose than outer; retinacular lobe distinct distally, fused proximally. Appendix masculina on endopod of first male pleopod (Figures 13o–q) with 5 short lateral spinules and 4 distal spinules, 3 elongate. Abdominal sternites unarmed. Uropods (Figure 14a) as in P. bermudensis. Eggs small and numerous, 0.4–0.6 mm in diameter.

SIZE.—Carapace lengths of males, 6.5–7.2 mm; of females, 7.0–10.8 mm; of ovigerous females, 9.3–10.8 mm.

COLOR.—Not recorded.