Cossura consimilis Read, 2000

Zhadan, Anna, 2015, Cossuridae (Annelida: Polychaeta: Sedentaria) from Australian and Adjacent Waters: the First Faunistic Survey, Records of the Australian Museum 67 (1), pp. 1-24: 6

publication ID 10.3853/j.2201-4349.67.2015.1639

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Cossura consimilis Read, 2000


Cossura consimilis Read, 2000  

Fig. 4 View Figure 4

Cossura consimilis Read, 2000: 1099   , figs 1–3.

Type locality. New Zealand, Big Glory Bay , Stewart Island, 46°58'54"S 168°7'31"E GoogleMaps   .

Material examined. New Zealand. 10 specimens, 2 posterior fragments, South Island , Banks Peninsula, Scrubby Bay (43°37'22"S 172°56'58"E), May 2002, Stn 1.1, W.45625 GoogleMaps   ; 6 specimens, South Island , Banks Peninsula, Scrubby Bay (43°37'22"S 172°56'58"E), May 2002, Stn 1.2, W.45626 GoogleMaps   ; 4 specimens, South Island , Banks Peninsula, Scrubby Bay (43°37'22"S 172°56'58"E), May 2002, Stn 2.1, W.45627 GoogleMaps   ; 12 specimens, South Island , Banks Peninsula, Scrubby Bay (43°37'22"S 172°56'58"E), May 2002, Stn 5.1, W.45628 GoogleMaps   .

Description. All specimens incomplete, 250–550 μm wide. 21–32 (usually 27–31) thoracic chaetigers but without sharp border between body regions. Anterior segments not swollen, without glandular pads or biannulations dorsally ( Fig. 4D,G View Figure 4 ). Chaetal bundles arise from anterior borders of segments in thorax; shifted to middle part of segments in the abdomen; chaetae less numerous and thinner, segments longer in abdomen; in posterior region segments very short ( Fig. 4A,E,H View Figure 4 ).

Prostomium blunt conical, with round tip, with more or less developed prostomial furrow, depending of muscle contraction ( Fig. 4B,G View Figure 4 ). Branchial filament attached to segmental border between chaetigers 2 and 3; in some specimens it is closer to chaetiger 2 ( Fig. 4D,G View Figure 4 ), in others closer to chaetiger 3 ( Fig. 4F View Figure 4 ).

Chaetiger 1 with uniramous parapodia, all the next segments bearing biramous parapodia with closely arranged rami ( Fig. 4D,F View Figure 4 ). All chaetate hirsute capillaries, arranged in two rows, especially clear in anterior chaetigers ( Fig. 4F View Figure 4 ). Thicker and shorter chaetae located in anterior row, thinner ones in posterior; neurochaetae slightly thicker than notochaetae or same width ( Fig. 4D,E,F View Figure 4 ). First chaetiger bearing 7–8 chaetae; in next thoracic segments 5–6 + 6–7 chaetae in notopodia and 4–5 + 5–6 in neuropodia in anterior and posterior rows, respectively; in posterior thoracic segments chaetae more numerous and thinner. In abdominal segments 4–5 long thin capillaries in notopodia and 5–6 in neuropodia. In posterior abdomen chaetae arising from lateral buds ( Fig. 4H View Figure 4 ).

Pygidium with three long anal cirri, without intercirral processes ( Fig. 4H View Figure 4 ).

Remarks. The main differences from the original description ( Read, 2000) is the attachment of branchial filament between chaetigers 2 and 3 instead of the anterior border of chaetiger 3, a different interpretation of prostomium-peristomium border and less average number of thoracic chaetigers, but later can be due to size variability of this character. Cossura consimilis   is very similar to C. soyeri   from the Mediterranean and Gulf of Mexico: both species have a high number (21–31) of thoracic chaetigers, a very close position of branchial filament (between chaetigers 2 and 3 or on posterior border of chaetiger 2, respectively), pygidium with three anal cirri and without other papillae.












Cossura consimilis Read, 2000

Zhadan, Anna 2015

Cossura consimilis

Read, G 2000: 1099