Marphysa disjuncta Hartman, 1961

Sahin, Güley Kurt, 2014, Marphysa cinari, a new species of Eunicidae (Polychaeta) from the coasts of Turkey (eastern Mediterranean) and re-descriptions of Marphysa kinbergi McIntosh, 1910 and Marphysa disjuncta Hartman, 1961, Journal of Natural History (J. Nat. Hist.) 48 (33 - 34), pp. 1989-2006 : 2000-2003

Marphysa disjuncta Hartman, 1961

( Figures 8 , 9 )

Marphysa disjuncta Hartman 1961: 81–83 , pl. 10, figs 1–3; Hartman 1968: 729–730, figs 1–3; Fauchald 1970: 60–61; Miura 1977: 71–73, fig. 5.

Material examined

One specimen, LACM-AHF POLY 2393 , North Pacific Ocean , USA, California, Los Angeles County, 2.2 miles [3.5 km] east-southeast (bearing 114° T) from Los Angeles Light , 33°41'36 ″ N, 118°12'37 ″ W, 13 fathoms [23.8 m], sand and mud, Hayward Grab, R / V Velero IV, Sta. 2107–52, coll. Allan Hancock Foundation, 20 April 1952 . Five specimens, LACM-AHF POLY 2394 , North Pacific Ocean , USA, California, Ventura County, 6.5 miles [10.5 km] 240° T from Ventura Pier Light , 34°13'02 ″ N, 119° 24'35 ″ W, 21.5 fathoms [39.3 m], dark olive green sandy silt, Hayward Grab, R / V Velero IV, Sta. 5339–57, coll. Allan Hancock Foundation, 20 October 1957 .

Description

Topotype complete with 280 chaetigers, L10 = 5.1 mm, W10 = 2.4 mm, TL = 126.1 mm. Body rounded in first chaetigers, flattened after chaetiger 4 through the posterior, prebranchial segments enlarged, light pink colour in ethanol ( Figure 8A ). Prostomium (1.2 mm) shorter than peristomium (1.6 mm), slightly bilobed anteriorly, rounded, wider than long with five prostomial appendages.

Prostomial appendages in a horseshoe pattern, longer than prostomium, similar thickness. Palps shorter than antennae, digitiform, reaching front of chaetiger 1. Antennae tapering, median antenna slightly longer than lateral antennae. Lateral antennae reaching middle of chaetiger 2, median antenna reaching front of chaetiger 3. Eyes absent. Palpophores and ceratophores short, wider than long. Palpostyles and ceratostyles without articulations. Peristomium cylindrical with distinct rings; anterior ring (1.1 mm) twice as long as posterior one (0.5 mm). Peristomial cirri absent.

Maxillary apparatus with five pairs of maxillae. Maxillary formula = 1 + 1; 6 + 6; 7 + 0; 3 + 4; 1 + 1.

Branchiae pectinate, from chaetiger 13 to 29, longer than dorsal cirri; 10 filaments at first one, up to 23 at chaetiger 25, stems tapering; filaments tapering, similar in size and thickness.

Anterior dorsal cirri small: cylindrical from chaetiger 2 to chaetiger 12; elongated, cylindrical and tapering in chaetigers 13 to 42; thinner, spindle-shaped, become shorter from chaetiger 43 until last. Anterior ventral cirri small, conical, basally slightly inflated from chaetiger 2 to chaetiger 13; reduced, pad-like from chaetiger 14 to 44; reduced to small swellings, indistinct basally from chaetiger 45 until last.

Prechaetal lobes inconspicuous, transverse fold in all chaetigers. Postchaetal lobes conical in all chaetigers, decreasing gradually until becoming inconspicuous ( Figure 9 ).

Supra-acicular chaetae with 18–20 limbate in anterior chaetigers, three to five in posterior and two to five pectinate chaetae in all chaetigers except anterior ones. Subacicular chaetae with 30–35 compound spiniger chaetae in anterior; three to five in posterior chaetigers. Limbate chaetae slender, marginally smooth ( Figure 8B ); one type pectinate chaeta, heterodont, marginal teeth longer than others, shafts narrow, thick, with eight or nine teeth ( Figure 8D ), present from postbranchial segments; compound spiniger chaetae with smooth and tapering blade, approximately 281 µm long ( Figure 8C, F ); shafts inflated. Compound falciger chaetae absent. Aciculae black with pale tips, three to four per parapodia, distally blunt. Subacicular hooks dark brown with light tips, unidentate ( Figure 8E ), distally blunt or slightly curved, first present from chaetiger 31. Pygidium with two long anal cirri.

Figures

Figure 8. Marphysa disjuncta (LACM-AHF POLY 2393). (A) Dorsal view of anterior end; (B) limbate chaetae (chaetiger 5); (C) compound spiniger chaeta (chaetiger 10); (D) pectinate chaeta (chaetiger 35); (E) subacicular hook (chaetiger 92); (F) large view of compound spiniger chaeta (chaetiger 10). Scale bars: A, 2 mm; B, 200 µm; C, 50 µm; D, 20 µm; E, 60 µm; F, 40 µm.

Figure 9. General view of parapodia of Marphysa disjuncta. (A) Parapodium from chaetiger 5; (B) parapodium from chaetiger 45; (C) parapodium from chaetiger 250. Scale bars: A–C, 200 µm.