Pelogenia salazarvallejoi, Cruz-Gómez, 2022
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A species of Pelogenia with short palps reaching segments 5–7; middorsal lobe of segment II absent, surface papillate; neurochaetae from segment II with smooth basal surface; neurochaetae from posterior segment with short slender blades; papillate medial process in posterior elytra.
This species is named after Dr Sergio I. Salazar-Vallejo, a Mexican specialist on polychaetes, in recognition of his generous advice and guidance during my continuous training on systematics. The epithet is a noun in the genitive case ( ICZN 1999, Art. 31.1.2).
Paratype SAINT MARTIN • 1 complete spec., 106 segments, 4.3 cm long, 1.1 cm to segment 30, 0.4 cm wide; Le Galion ; 18°04′40″ N, 63°00′53″ W; depth 1–2 m; 21 Apr. 2012; John Slapcinsky leg.; sand and seagrass; UF 2764 GoogleMaps .
UNITED STATES OF AMERICA • 1 incomplete spec., 68 segments, 4.8 cm long, 1.5 to segment 30, 1.8 cm wide; Florida, Bear Cut ; approximately 25°43′56″ N, 80°09′37″ W; low tide; 23 Aug. 1965; J.A. Jones leg.; on Thalassia sp. ; UF GoogleMaps .
BODY. Pale whitish, short, broad ( Fig. 21A View Fig ), 84 segments, 3.9 cm long, 1.2 cm to segment 30, 0.3 cm wide. Middorsal line covered with foreign white particles attached to adhesive papillae ( Fig. 21B View Fig ). Venter covered only with short globular papillae ( Fig. 21C View Fig ).
PROSTOMIUM. Oval, longer than wider. Two pairs of eyes, anterior eyes larger, inserted anteriorly. Lateral antennae long, ceratophores as long as styles, dorsally fused with tentacular segment and partially covered by median antennal ceratophore ( Fig. 21D View Fig ). Median antenna ceratophore bulbous, slightly longer than prostomium, with a longitudinal ridge; style as long as ceratophore ( Fig. 21D View Fig ). Middorsal lobe of segment II absent, but surface papillate. First segment directed anteriorly; fused with tentacular segment (right and left parapodia fused anteriorly); 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 short, reaching segment five, with inner palpal sheaths ( Fig. 21C View Fig ).
ELYTRA. First three right elytra missing. First left elytron subrectangular with one medial process ( Fig. 22F View Fig ), covered with coarse sand; two kinds of papillae: elytral surface with pedunculate papillae with flat tips, elytral margin with dendritic papillae. Second left elytron subrectangular, with three posterior and two medial processes, separated by a median notch ( Fig. 22G View Fig ); two kinds of papillae: elytral surface with pedunculate papillae with flat tips, elytral margin with short dendritic papillae, longer papillae over elytral processes ( Fig. 22I View Fig ). Posterior right elytron oval with five posterior processes and two large medial processes, separated by a median notch ( Fig. 22H View Fig ), elytral surface with pedunculate papillae with flat tips, elytral margin with short and long dendritic papillae ( Fig. 22J–L View Fig ).
RIGHT PARAPODIUM FROM SEGMENT II ( Fig. 21F View Fig ). Notopodia truncated, papillate, slightly shorter than neuropodia, with an antero-dorsal distal lobe. With up to 80 simple verticillate notochaetae, shortest ones as long as notopodia, longest ones 3 × as long as neuropodia ( Fig. 21G View Fig ). Neuropodia conical, papillate, larger than notopodia. Neurochaetae only falcigers, bifid with most blades with subdistal tooth lost, falcate: unit A, two falcigers with handles completely covered with transverse rows of spines, blades medium-sized, 8× as long as wide ( Fig. 21H View Fig ); unit B, two falcigers with handles thick with 4 transverse rows of spines, blades medium-sized, 6–7 × as long as wide ( Fig. 21I View Fig ); units C and D undifferentiated, six falcigers with handles thick completely covered by transverse rows of spines, blades long, 14–16 × as long as wide ( Fig. 21J View Fig ).
RIGHT PARAPODIUM FROM SEGMENT III ( Fig. 21K View Fig ). Notopodia truncated, papillate, slightly shorter than neuropodia, with an antero-dorsal dendritic distal lobe. Dorsal cirrus with cirrophore half as long as cirrostyle ( Fig. 21E View Fig ). With up to 50 simple verticillate notochaetae, shortest ones as long as notopodia, longest ones 3× as long as notopodia ( Fig. 21L View Fig ). Neuropodia leaf-shaped, papillate, larger than notopodia. Neurochaetae only falcigers; all blades unidentate: unit A, four falcigers with handles thick, with 3 transverse rows of spines, blades short, 2–3× as long as wide ( Fig. 21M View Fig ); unit B, five falcigers with handles thick, with one transverse rows of spines, blades short, 2× as long as wide ( Fig. 21N View Fig ); units C and D undifferentiated, two falcigers with handles slender, smooth, blades long, 10–11 × as long as wide ( Fig. 21O View Fig ).
RIGHT PARAPODIUM FROM SEGMENT 27 (MIDDLE SEGMENT) ( Figs 21P View Fig , 22A View Fig ). Notopodia conical, smooth (non-papillate), short, half as long as neuropodia. With up to 50 simple verticillate notochaetae, tips hooked, shortest ones half as long as notopodia, longest ones 4× as long as notopodia ( Figs 21Q View Fig , 22C View Fig ). Neuropodia conical, papillate ( Fig. 22B View Fig ), larger than notopodia. Neurochaetae only falcigers; most blades unidentate, units D and subunit 2 with blades bifid: unit A, two falcigers with handles thick, smooth, blades short, 2× as long as wide ( Figs 21R View Fig , 22D View Fig ); unit B, one falciger with handle thick with 5 transverse rows of spines, blades long, 11× as long as wide ( Figs 21S View Fig , 22D View Fig ); unit C, four falcigers with handles thick with 8–10 transverse rows of spines, blades short, 2–3× as long as wide ( Fig. 21T View Fig ); subunit 1, one falciger with handle thick, smooth, blade short, 2× as long as wide ( Fig. 21U View Fig ); subunit 2, two falcigers with handles slender, smooth, blades long, 11–12 × as long as wide ( Figs 21V View Fig , 22E View Fig );
unit D, three falcigers with handles slender, with transverse rows of denticles, blades medium-sized, 6–7× as long as wide ( Fig. 21W View Fig ).
PYGIDIUM. Round with two anal cirri ( Fig. 22M View Fig ).
Pelogenia salazarvallejoi sp. nov. belongs to the pelogenins with a short cirrostyle on segment III, and resembles P. zeylanica (Willey, 1905) from Sri Lanka ( Ceylon). However, there are evident differences, the most important being the presence of a distal lobe on the dorsal notopodial margin on all segments except the first one, and by having a middorsal ridge on the medial antennal ceratophore. In P. salazarvallejoi sp. nov. the neurochaetae from segment II are falcigers with smooth handles, and the posterior elytra have five medial processes and two large posterior processes; while P. zeylandica has neurochaetae from segment II with transverse rows of spines ( Pettibone 1997: 36, fig. 25d), and the posterior elytra only have two medial processes, and two posterior processes ( Pettibone 1997: 37, fig. 26f). It should be noted that although most of the specimens examined show the short style in the dorsal cirri in segment III, the specimen from Florida shows a short right style but the left one is of similar length as the cirrophore. Additionally, in this material a small syllid was found attached to the dorsal side of the body, among posterior elytra ( Fig. 22N View Fig ).
Grand Caribbean region. From Florida to Saint Martin, French Antilles.
Florida Museum of Natural History- Zoology, Paleontology and Paleobotany
Departamento de Geologia, Universidad de Chile
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