What is the oldest known fossil bamboo coral?

More Mark McMenamin's questions See All

Differences between sheep blood with Alsever solution vs citrated/defibrinated sheep blood in microbiological media?

I am aware of a study that has compared the use of citrated and defibrinated sheep's blood in microbiological media (Hair Sheep Blood, Citrated or Defibrinated, Fulfills All Req... ), but can...

10 February 2021 5,927 1 View

Infinite order of Laguerre?

If Lmn(x) is the Laguerre polynomial of order m and degree n Is there a means of computing Lmn(x) for 1) m goes to infinity 2) n goes to infinity

08 February 2021 6,320 4 View

Sharpening algorithm for similar images with different levels of blurring?

Say for arguments sake I have two or more images with different degrees of blurring. Is there an algorithm that can (faithfully) reconstruct the underlying image based in the blurred...

17 January 2021 7,324 3 View

How to make a pushover Analysis of a reinforced cantilever beam in ABAQUS?

Hello everyone, Im doing a pushover Analysis of a cantilever beam in ABAQUS, made of reinforced concrete, but my model doesnt seem to converge proberly. The program simply aborts before hitting a...

15 January 2021 1,627 3 View

How to illustrate FE Panel Regression with LSDV in a research framework?

First time to use FE Panel Data Regression using LSDV, and not familiar with how to illustrate it in a research framework. We have regional CSR score as IV and Social Development ( four areas:...

14 January 2021 580 3 View

Domestic ancient Egyptian gods and goddesses?

Who are the gods that ancient Egyptians thought of as closer to them and could have a personal connection with them?

25 December 2020 5,505 1 View

Could someone help me recheck my identification of my moth samples?

Greetings to all! I am humbly asking for some help, in regards to the checking of my moth samples. Though it is of great inconvenience to you all, I will respect your decision nevertheless....

08 December 2020 6,009 5 View

Is there a relationship that can be used to relate flow rate (m3/s) to MPa in fluid injection rate?

I am doing simulation exercise of which I have to inject fluid pressure into a borehole. The parameters I am using the injection rate is given in pressure (MPa) and the software accept injection...

01 December 2020 3,221 2 View

What is the current and voltage profile for a short dipole antenna when the monopoles have different lengths?

The textbooks show a triangular pattern for the current as the limiting case for a short dipole, and how this may be considered to be the limiting case for the sinusoidal current distribution....

26 November 2020 5,280 5 View

Best way to teach Data Structures and Algorithms?

Next semester I am teaching an online class on Data Structures and Algorithms. The students will have had two programming classes in C++ and Java each. I am looking for a way to engage the...

11 November 2020 1,176 4 View

Would fecal samples stored at -20C for over a year impact metagenomic analysis?

Dear All, I have access to some rodent fecal samples that have been stored at -20C instead of -80C. Anyone have experience with the impact of stowage condition on comparative metagenomic analysis...

01 March 2021 2,512 1 View

Is IMPACT FACTOR justified in case of Taxonomy?

There is huge pressure of getting good impact factor on scholars now a days. On the other hand Taxonomy is a very dry subject and the concerned papers can only get citation in same group of organism.

26 February 2021 5,851 1 View

Any references about insects or animals that can damage or weathering of rock or fossil material?

Are there any references to insects or animals that can cause damage or weathering to the rock or fossil material? books or paper that would be nice. Thank you very much!

24 February 2021 6,805 3 View

Is this the fragment of a sauropod tooth?

Dear colleagues. Fragments of this species are very rare from a terrestrial Lower Cretaceous locality from Germany. Up to now from this locality sauropods could not be proved with certainty. Other...

14 February 2021 2,310 1 View

What is the correct common name for Hydrochoerus hydrochaeris?

There are two extant species of Hydrochoerus: Hydrochoerus isthmius, the lesser or Panamanian capybara, and the genotype species H. hydrochaeris. The latter is the more common species of capybara,...

11 February 2021 3,494 14 View

Can anyone recommend a scale to measure Bloom's taxonomy of learning styles?

I am looking for recommendations of scales (in English or Spanish) to measure learning styles according to Bloom's taxonomy of learning. Thank you in advance!

09 February 2021 1,419 8 View

Which is the most accepted taxonomy in Resistance to Change literature?

I am searching for a well accepted taxonomy of resistance to change and in terms of its underlying causes/roots.

04 February 2021 497 3 View

Does someone know which structure could exit the olfactory bulbs at their antero-dorsal top ?

Hi people, I am studying bat brains through endocranial casts and I cannot identify which structure could be present in sort of a canal located dorsally to the cribriform plate. It is like...

27 January 2021 797 6 View

Why and how to avoid negative values in optical density by spectrophotometry when measurements corrected by blank solvent?

I am trying to assess chlorophyll-a content from coral tissue using spectrophotometry (with SPECTROstar Nano, BMG). However, I always seem to obtain some negative values in my optical density raw...

20 January 2021 1,542 4 View

Numerical taxonomy with SPSS?

Hi everyone, I was wondering about the possibilities of performing numerical taxonomy with SPSS software. I would be very thankful to recieve advice!! For now I have been reading about...

12 January 2021 5,549 3 View

Ismael Coronado

Hello Mark,

I think that no. The first record of Isidade is Cretaceous although the first record of octocorals could be oldest. May be Cambrian (Ausich & Babcock, 1998; Taylor et al., 2013), Early Ordovician (Lindström, 1978; Cope, 2005), Silurian (Bengtson, 1981) or even Ediacaran (McMennamin, 1998), the earliest known spiculate alcyonaria is Atractosella, from the Llandovery-Wenlock of Gotland (Sweden). Nevertheless, most alcyonarian remains are from the Cretaceous and Cenozoic (Bayer, 1956; Nudds & Löser, 2001). I recommend to you Cope (2005) and Bayer (1956) to control the most part of the bibliography about that.

Regards,

Ismael

Mike Reich

As far as I know, there is no unequivocal record of Pre-Cretaceous Isididae ... Please cf. also some Recent "primary papers" by Schlagintweit & Gawlick 2009: The incertae sedis Carpathoporella Dragastan, 1995, from the Lower Cretaceous of Albania: skeletal elements (sclerites, internodes/branches, holdfasts) of colonial octocorals. Facies 55: 553-573 or Helm & Schülke 2003: An almost complete specimen of the Late Cretaceous (Campanian) octocoral "Isis" ramosa Voigt (Gorgonacea) from the Lower Saxony Basin, northwest Germany. Cretaceous Research 24: 35-40. Both are available online ...

Best wishes, Mike