Identificaciones de woodillj

Stephanopogon mesnili from the intertidal benthos of marine estuary Accabonac Harbor. With its 4 anterior barbs and size of 45 um, my observation corresponds to Stephanopogon mensnili (see discussion below and supporting figure). Imaged in Nomarski DIC on Olympus BH2 using SPlan 40x objective plus variable phone cropping on Samsung Galaxy S9+.

"STEPHANOPOGON is a taxon of ciliate-like protists from marine sediments. These cells are flattened, with an extensively ciliated ventral face, and a broad anterior feeding apparatus that is used for the raptorial capture and ingestion of prey, including pennate diatoms and other surface-associated protists (Patterson and Brugerolle 1988; Larsen and Patterson 1990; Yubuki and Leander 2008). Originally Stephanopogon was treated as an unusual type of ciliate, on the basis of light microscopy data (Entz 1884; Lwoff 1923, 1936; Jones and Owen 1974), and then as a protist of uncertain affinity, due to its ultrastructural dissimilarity from ciliates (Lipscomb and Corliss 1982; Patterson and Brugerolle 1988). Molecular phylogenies have since established that Stephanopogon is actually a member of the taxon Heterolobosea, and is most closely related to Percolomonas (Cavalier-Smith and Nikolaev 2008; Yubuki and Leander 2008) with some possible ultrastructural apomorphies also nominated for the Stephanopogon–Percolomonas group (Yubuki and Leander 2008)" (1).

"Six species of Stephanopogon have been described so far: S. apogon, S. mesnili, S. mobiliensis, S. paramesnili, S. colpoda and S. minuta. These species are distinguished from one another by differences in the number of barbs,
the number of flagellar rows on the ventral surface and cell size (Jones and Owen 1974; Lei et al. 1999).

S. apogon is easily distinguished from the other five species because it is large (50–90 mm in length), has 12–14 rows of flagella and is the only species without barbs at the anterior end of the cell (Al-Qassab et al. 2002; Borror 1965; Jones and Owen 1974; Patterson and Brugerolle 1988; Larsen and Patterson 1990).

S. mobiliensis and S. mesnili have five and four anterior barbs, respectively (Kahl 1930; Jones and Owen 1974; Lwoff 1936). S. mobiliensis is 19–25 mm long and
possesses eight rows of flagella (Jones and Owen 1974), while S. mesnili is 40–70 mm long and possesses 12 rows of flagella (Dragesco 1963; Kahl 1930).
The remaining three species of Stephanopogon have three anterior barbs. Cells of S. colpoda are 50–90 mm long and have 12–14 rows of flagella (Entz 1884; Dragesco 1963; Kahl 1930; Hayward and Ryland
1990).

The cells of S. paramesnili are the largest in this genus, at 60–110 mm long, and have 11–13 rows of flagella (Lei et al. 1999). S. minuta are among the smallest in the genus, at 32–35 mm long, and have 7–8
rows of flagella (Lei et al. 1999)" (2).

1. Morphological and Molecular Characterization of a New Species of Stephanopogon, Stephanopogon pattersoni n. sp. Won Je Lee, Kai Miller & Alastair G.B. Simpson.
   Journal of Eukaryotic Microbiology 2014, 61, 389–398

2. Ultrastructure and molecular phylogeny of Stephanopogon minuta: An enigmatic microeukaryote from marine interstitial environments Naoji Yubuki, Brian S. Leander. European Journal of Protistology 44 (2008) 241–253

3. Supporting figure adapted from: Kingdoms and Domains
   An Illustrated Guide to the Phyla of Life on Earth
   2009, Pages 117-230
   Kingdoms and Domains
   Chapter Two - KINGDOM PROTOCTISTA
   LynnMargulisUniversity of Massachusetts at Amherst Michael JChapman Marine Biological Laboratory Woods Hole, Massachusetts, USA.

Figure Pr-24A. The four species of Stephanopogon (stephano = Gk.crown; pogon = plug) colpoda drawn from work of John Corliss, 1979; Stephanopogon mesnili (based on a drawing by Andre Lwoff, c.1922), Stephanopogon apogon work of A. Borror, c.1965 and Stephanopogon mobilensis based on Jones and Owen’s studies, c. 1974. See Margulis and Chapman, 2010 for details.

Chaetoceros species from the channel leading from Great Peconic Bay to Cold Spring Pond at Inlet Road.

Chaetoceros is probably the largest genus of marine planktonic diatoms with approximately 400 species described, although many of these descriptions are no longer valid. It is often very difficult to distinguish between different Chaetoceros species.[1][2] Several attempts have been made to restructure this large genus into subgenera and this work is still in progress.[3][4] However, most of the effort to describe species has been focused in boreal areas, and the genus is cosmopolitan, so there are probably many tropical species still undescribed.[5] Some species are known from the fossil record, from the Quaternary of Sweden. It is the type genus of its family.

The genus Chaetoceros were first described by Ehrenberg in 1844.
Cells are more or less rectangular in girdle view.
Cells are usually elliptical in valve view.
Opposite setae of adjacent cells touch near their origin.

Each frustule has four siliceous processes called mushrooms or thorns that allow them to stay together forming colonies.

Chaetoceros is primarily a marine genus, but there are also accounts of species within inland waters of the United States. It is a type of centric diatom that contains a frustrule or cell wall composed of silica that contain long, thin spines (setae). The spines connect the frustules together creating a colony of cells.[6] Cells colonies can form chains that are coiled, straight, or curved. Cell size can range from <10 um to 50 um.[7]