Pelogenia hartmanae Pettibone, 1997

Cruz-Gómez, Christopher, 2022, Pelogeniinae Chamberlin, 1919 (Annelida, Sigalionidae) from the Grand Caribbean Region, European Journal of Taxonomy 807, pp. 1-59 : 35-39

Pelogenia hartmanae Pettibone, 1997

Figs 15–16

Pelogenia hartmanae Pettibone, 1997: 65 , figs 47–48.

Material examined

HONDURAS • 1 incomplete spec.; off Santa Rosa de Augán; 16°07′ N, 85°38′ W; R/V Pillsbury, Stn 1369; depth 56 m; 2 Feb. 1971; UMML 7101-1369 .

Description

BODY. Pale maroon, long, very broad ( Fig. 15A ); 65 segments, 5.1 cm long, 1.4 cm to segment 30, 0.8 cm wide. Middorsal line covered with coarse sand and foraminifera attached to adhesive papillae ( Fig. 15E ). Venter covered with short globular and long dendritical papillae ( Fig. 15F ).

PROSTOMIUM. Spherical. Two pairs of eyes, anterior eyes slightly larger, inserted anteroventrally. Lateral antennae long, ceratophores longer than styles ( Fig. 15B ), dorsally fused with tentacular segment, visible below median antennal ceratophore. Median antennal ceratophore bulbous, as long as prostomium, with a transverse ridge; style long, 3× as long as ceratophore ( Fig. 15D ). Middorsal lobe of segment II absent. First segment directed anteriorly; fused with tentacular segment; biramous, chaetae simple verticillate. Dorsal tentacular cirrus longer than neuropodia including chaetae, ventral tentacular cirrus slightly shorter than dorsal tentacular cirrus, but longer than neuropodia; palps reaching segment six, with inner palpal sheaths ( Fig. 15C ).

ELYTRA. First right elytron oval, longer than wide, with one medial process, covered with coarse sand, spicules and foraminifera ( Fig. 16E ), two kinds of papillae; elytral surface with short flat and pedunculate papillae with flat tips, more abundant on elytral center; elytral margin with short pedunculate papillae with puffed tips ( Fig. 16G ). Second and third right and left elytra lost. Posterior elytra subtriangular with three short medial processes, and two posterior processes, all enlarged, globose ( Fig. 16F, H–I ); four kinds of papillae: elytral surface with flat papillae and pedunculate papillae with flat tips; elytral margin with short dendritic papillae with and without puffed tips, and long dendritic papillae ( Fig. 16J–K ).

RIGHT PARAPODIUM FROM SEGMENT II ( Fig. 15H ). Notopodia conical, smooth (non-papillate), large, as long as neuropodia; notopodia flange rounded, papillate. With up to 60 simple verticillate notochaetae, falcate tips, shortest ones twice as long as notopodia, longest ones 3× as long ( Fig. 15I ). Neuropodia truncated, papillate, larger than notopodia. Neurochaetae only falcigers, all blades entire, falcate: unit A, three falcigers with handles slender with 12–13 transverse rows of spines, blades long, 17–18× as long as wide ( Fig. 15J ); unit B, three falcigers with handles very long, slender with 17–22 transverse rows of spines, blades long, 25× as long as wide ( Fig. 15K ); unit C, nine falcigers with handles slender, handle with 17–19 transverse rows of spines, blades long, 28–29 × as long as wide ( Fig. 15L ); unit D, two falcigers with handles slender with 7–8 transverse rows of spines, blades long, 20× as long as wide ( Fig. 15M ).

RIGHT PARAPODIUM FROM SEGMENT III ( Fig. 15N ). Dorsal cirrophore slightly shorter than cirrostyle ( Fig. 15G ). Notopodia truncated, smooth (non-papillate) short, slightly shorter than neuropodia; notopodia flange round, papillate. With up to 70 simple verticillate, falcate tips, shortest ones as long as notopodia, longest ones twice as long ( Fig. 15O ). Neuropodia conical, papillate, larger than notopodia. Neurochaetae only falcigers; most blades with subdistal tooth broken, unit D bifid: unit A, two falcigers with handles thick with 7–9 transverse rows of spines, blades medium-sized, 8× as long as wide ( Fig. 15P ); unit B, two falcigers with handles thick with 7–8 transverse rows of spines, blades long, 12–13× as long as wide ( Fig. 15Q ); unit D, three falcigers with handles slender with 8 transverse rows of spines, blades long, 19 × as long as wide ( Fig. 15R ).

RIGHT PARAPODIUM FROM SEGMENT 26 (MIDDLE SEGMENT) ( Figs 15S , 16A ). Notopodia conical, smooth (nonpapillate), slightly shorter than neuropodia. With up to 120 simple verticillate notochaetae, shortest ones as long as notopodia, longest ones twice as long ( Figs 15T , 16B ). Neuropodia conical, papillate, longer than notopodia. Neurochaetae only falcigers; all blades unidentate, falcate: unit A, three falcigers with handles thick with subdistal transverse rows of denticles, blades short, 3–4× as long as wide ( Figs 15U , 16C ); unit B, two falcigers with handles thick with subdistal transverse rows of denticles, blades short, 4–5× as long as wide ( Fig. 15V ); unit C, eight falcigers with handles slender with subdistal transverse

K = 100 μm.

rows of denticles, blades short, 2–3× as long as wide ( Fig. 15W ); subunit 1, one falciger with handle thick, smooth, with subdistal transverse rows of denticles, blade short, 2× as long as wide ( Fig. 15X ); unit D, four falcigers with handles slender with transverse rows of denticles, blades long, 12× as long as wide ( Figs 15Y , 16D ).

POSTERIOR REGION. Lost.

Remarks

This specimen agrees with the original description by Pettibone (1997).

Distribution

Caribbean Sea. From Puerto Rico to Honduras.

Figures

Fig. 15. Pelogenia hartmanae Pettibone, 1997, non-type specimen (UMML 7101-1369). A. Incomplete fragmented worm, dorsal view. B. Anterior end, dorsal view. C. Anterior end, ventral view. D. Detail of median antenna ceratophore. E. Dorsal papillae (close-up in box). F. Ventral papillae (close-up in box).G. Right cirrus from segment III. H. Right parapodium from segment II. I. Notochaeta from same. J. Unit A. K. Unit B. L. Unit C. M. Unit D. N. Right parapodium from segment III. O. Notochaeta from same. P. Unit A. Q. Unit B. R. Units C and D. S. Right parapodium from segment 26. T. Notochaeta from same. U. Unit A. V. Unit B. W. Unit C. X. Subunit 1. Y. Unit D. Scale bars: A = 2 mm; B–C = 1 mm; D = 50 µm; E–F = 20 µm; G–H, N, S = 500 μm; I, O, T = 40 μm; J–M, P–R, U–Y = 50 μm.

Fig. 16. Pelogenia hartmanae Pettibone, 1997, non-type material (UMML 7101-1369). A–D, J–K. SEM micrographs. A. Right parapodium from segment 25. B. Notochaeta from same. C. Unit A. D. Unit D. E. First right elytron. F. Posterior elytron. G. Distal expansion from E. H. Margin from F. I. Posterior process from F. J. Surface of posterior elytron with flat papillae and pedunculate papillae with flat tips. K. Posterior process, long dendritic papillae and pedunculate papillae with flat tip. Abbreviations: a = anterior; p = posterior. Scale bars: A = 500 μm; B = 10 μm; C = 20 μm; D, J = 50 μm; E–F = 1 mm; G–I,