Teloscalpellum Zevina, 1978

Young, Paulo S., 2002, Revision of the Scalpellidae (Crustacea, Cirripedia) in the collection of the Muséum national d’Histoire naturelle, France, studied by Abel Gruvel, Zoosystema 24 (2), pp. 309-345 : 325-328

Genus Teloscalpellum Zevina, 1978

Teloscalpellum luteum (Gruvel, 1900) ( Figs 13-15 )

Scalpellum luteum Gruvel, 1900a: 192 ; 1902a: 80, 135, pl. 2, figs 3E, 11, pl. 4, figs 4, 9, 10; 1902c: 248; 1902d: 523; 1905: 84, fig. 93. — Nilsson-Cantell 1955: 218. — Zevina 1976: 1155.

Teloscalpellum luteum – Zevina 1978b: 1350; 1991a: 362, fig. 280. — Young 1998a: 44, figs 4, 6.

TYPE MATERIAL. — SW of Azores, Talisman, 1883 , drag. 118, 34°46’N, 36°11’W, 3175 m, holotype by monotypy, only left side entire, right side with only capitular plates of lower whorl, cl (tl) 20.7 (28.4) mm ( MNHN Ci 398).

MATERIAL EXAMINED. — No locality, 1 spec. with the plates disarticulated in very bad condition ( MNHN Ci 384).

DIAGNOSIS. — Capitulum with plates striated, except by carina and carinal portion of tergum. Carina with tectum concave bordered by high lateral ridges. Upper-latus pentagonal, umbo subapical, projecting. Inframedianlatus triangular, higher than wide, with umbo subapical and projected. Cirrus I with anterior ramus three quarters the length of posterior ramus. Median article of cirrus VI four pairs of setae on anterior margin and a row of three to seven setulae on lateral surface. Caudal appendage as long as protopodite of cirrus VI.

DESCRIPTION

Capitulum ( Fig. 13A ) oval, length less than twice the width, carinal and occludent margins similarly curved. Plates striated, except by carina and carinal portion of tergum, with thin growth lines. Cuticle thin, pilose.

Tergum ( Fig. 13A ) with its surface area greater than scutum; inconspicuous apicobasal ridge. Basal margin nearly straight. Carinal margin slightly convex at lower portion and concave near apex. Occludent margin straight. Apex blunt, straight.

Scutum ( Fig. 13A ) with carinal portion flat and occludent portion convex, with conspicuous apicobasal ridge; height twice the greatest width. Basal margin straight. Tergal margin slightly concave, presenting a lid. Occludent margin convex. Lateral margin convex except for upper concavity to accept apex of upper-latus. Apex curved, slightly superimposed on tergum.

Carina ( Fig. 13A, C ) arching accentually at apical portion, wider at upper portion, with umbo apical. Tectum strongly concave bordered by high lateral ridges; basal margin W-shaped.

Upper-latus ( Fig. 13A ) pentagonal with apex curved toward scutum, umbo subapical, projecting. Scutal margin largest, followed in size by tergal, carino- lateral, carinal and, the smallest rostro-lateral margins; scutal margin concave; other margins straight. Carino-latus ( Fig. 13A, C ) nearly pentagonal, less than twice higher than wide, with umbo at carinal base, slightly projecting backward; with a ridge from umbo to basal angle and another from umbo to upper-inframedian latera junction. Carino-latera interdigitating with one another below carina.

Inframedian-latus ( Fig. 13A ) triangular, higher than wide, slightly curved to rostro-latus, shorter than rostro-latus, umbo subapical and projected.

Rostro-latus ( Fig. 13A, B ) trapezoidal, wider than high, with conspicuous apico-basal ridge; basal one half of distal margin, parallels, umbo projecting slightly backwards. Rostrum ( Fig. 13B ) absent. Peduncle ( Fig. 13A ) less than half capitulum length, mostly covered by wide, large scales in a sr-l-sc; rl-cl1-cl2 pattern.

Labrum ( Fig. 14A ) bullate, without teeth. Palp ( Fig. 14A ) short, thin, with simple setae on margins. Mandible ( Fig. 14B ) with three acute teeth, distance between first and second tooth 1.5 times the distance between second and third; lower angle weakly denticulate. Maxilla I ( Fig. 14C, D ) with anterior border having an inconspicuous, shallow, medial notch on one of them and a deep notch on the other; two or three large and 12-16 smaller unpaired spines. Maxilla II ( Fig. 14E ) nearly triangular with anterior margin nearly straight, covered by numerous simple or finely pinnate setae; papilla of maxillary gland strongly pronounced.

Cirrus I ( Fig. 15A) with unequal rami, anterior ramus three quarters length of posterior ramus; former with protuberant articles. Cirrus II to VI with equal, long rami. Median article of cirrus VI ( Fig. 15B, C) twice longer than wide, four pairs of simple or finely pinnate setae, unequal in size, and few fine setulae between pairs on anterior margin; a row of three to seven setulae on lateral surface; two to five setae on posterior angle, sometimes with setae displaced along posterior margin. Setal-article ratio about 3:1. Caudal appendage ( Fig. 15D) with eight articles, as long as protopodite of cirrus VI; articles with few, long setae on distal margins, and cluster of simple setae on apex. Penis absent. Number of articles of cirri I-VI and caudal appendage is presented in Table 5.

REMARKS

Teloscalpellum luteum was described from SW Azores ( Gruvel 1900a; 1902a) and subsequently recorded only once from the same region ( Young 1998a). The specimens from Young (1998a: 44) are very similar to the holotype. The differences observed are that its labrum has small denticles instead of nude and the maxilla II do not present notch. T. luteum are recorded from depths between 3056- 3000 m and 3175 m.

Figures

FIG. 13. — Teloscalpellum luteum (Gruvel, 1900), holotype (MNHN Ci 398); A, left lateral view; B, rostral view; C, carinal view. Scale bars: A, 5 mm; B, C, 3 mm.

FIG. 14. — Teloscalpellum luteum (Gruvel, 1900), holotype (MNHN Ci 398); A, labrum and palp; B, mandible; C, D, right and left maxilla I; E, maxilla II. Scale bars: 0.5 mm.